Shoe rasping device



W. C. CARD, JR

SHOE RASPING DEVICE Filed Dec. 13,

Patented Dec. 8, 1936 SHOE RASPING DEVICE Application December 13, 1933, Serial No. 702,110

2 Claims.

This invention relates to a machine for use in the manufacture of footwear and, more particularly, to that type of footwear wherein cement is used adhesively to afiix an outer sole to a lasted shoe upper.

Generally, it is an object of the invention to provide a machine which will rapidly, uniformly and efficiently remove hardened excess cement, rough edges, etc., from insoles which will be simple and economical of construction, and which will operate with freedom from wear and me chanical difiiculties.

Specifically, an object of the invention is to provide a mechanism which will eifect the removal, from the insole of a semi-finished shoe, of excess hardened cement which has gathered because of seepage or as a result of the pressure brought to bear upon the lasted upper and outer sole. during the sole affixing operation.

Another object of the invention is to provide a machine which will efficiently and readily prepare the upper surface of the insole of a shoe for reception of a sock lining by removing substantially all traces of hardened excess cement, etc., to produce a smooth and even upper surface on the insole.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the features of construction, combination of elements, and arrangement of parts, which will be exemplified in the construction hereinafter set forth and the scope of the invention will be indicated in the claims.

For a fuller understanding of the nature and objects of the invention reference should be had to the following detailed description taken in connection with the accompanying drawing showing one embodiment of the invention, in which:

Fig. 1 is a side elevational view, of a machine constructed in accordance with the invention showing a portion being broken away in order more clearly to illustrate a detail of construcionm Fig. 2 is an enlarged detail view with parts broken away showing the parts of that portion of the machine which extend into the forepart of a shoe.

A machine constructed in accordance with the principles of this invention may be used with particular advantage in the manufacture of shoes having cut-out insoles, the outer soles of which are flush with the surface of the insoles and are adhesively secured to the lasted upper by pyroXylin cement or the like. Such a method of shoe manufacture is disclosed for example in the Sbicca Patent No. 1,838,708 issued December 29, 1931. However, as will be readily understood by one skilled in the art, the use of the improved machine will be found to be advantageous wherever it is desired to smooth or remove irregularities from the upper surface of the insole of a finished or lasted shoe.

Referring more particularly to the drawing, there is shown a rigidly supported driving motor it to one end of which is secured a housing support M, which carries a rigid curved housing 92 which extends toward the operator and thence downwardly and away from the operator, so that its end is conveniently positioned for operating upon a shoe. The curved housing i2 encases a flexible shaft l3, one end of which is coupled with the motor shaft Hi, and the other end of which is coupled in driving relation with a button rasp it which rotates on a substantially vertical axis and has its operating face disposed substantially horizontally.

The driving motor It] is rigidly supported in any convenient manner so as to have the button rasp it in proper position with respect to the operator. For example it may be secured upon a pedestal it by means of bolts ll, the pedestal in turn being secured to a bench or table l8 by lag screws 59 or the like.

To the motor shaft it a sleeve coupling 20 is connected by means of a dowel pin 2!, or other suitable fastening means, the other end of the coupling being firmly connected to one end of the flexible shaft it. The flexible shaft it then extends through the curved housing 52 and its other end is operatively connected to the button rasp it as shown, for example, in Fig. 2.

In Fig. 2, it will be observed that the outer end of the flexible shaft i3 is firmly connected to a keyed coupling 2? which is keyed into a nonflexible extensor shaft 28 carried in a thrustbearing 32 which is held in the outer end of the curved housing it by means of set screws 33. The extensor shaft 28 is provided with an enlarged portion 29 integral therewith which is recessed and slotted to receive a reduced extension 353 and its associated key 3! of the keyed coupling 2'! whereby the flexible shaft i3 transmits its rotary motion to the non-flexible extensor shaft 28. Attached to the thrust-bearing 32 by means of set screws 35 is an angular housing a l which encloses the bevel gears or equivalent mechanisms by which the button rasp it may be driven with its axis disposed substantially vertically and its operating face disposed substantially horizontally. In the embodiment shown a bevel gear 36 is secured to the extensor shaft 28 in any suitable manner, for example by means of a pin 38 and is in turn meshed with a second. bevel gear 31 which is horizontally mounted in the lower end of said angular housing which forms a bearing therefor. Screwed into the horizontally mounted bevel gear 31 is the aforementioned button rasp l5 having its horizontal face provided with rasp teeth 39. The bevel gear 3? is held in position by an end plate 25 secured to the housing 34 by means of set screws 26. The end plate 25 is provided with a stepped opening 44 forming a vertical thrust-bearing with the shank 45 of the button rasp l5. When it is desired to unscrew the rasp from its operative position in order to sharpen or replace it, the operator merely grasps the rasp and turns a hand knob 40 secured at the other end of the motor shaft I4 on the motor H). In order to take up any slack, which might occur in the flexible shaft on account of use, or from other causes, and thereby forestall chattering, or in order to eifect a desired adjustment, the housing support H is split a substantial distance beyond two clamping members 22 which have openings 23 adapted to receive two machine bolts for holding the housing in its adjusted position. The keyed connection between the coupling 21 and the extensor shaft 28 is sufficiently tight to permit this operation but nevertheless permits separation of the parts when it is desired to dismantle the machine or replace the parts.

Preferably the shaft housing is underslung to- Ward the rear of the standard and driving motor and spaced a sufficient distance therefrom conveniently to allow a comfortable manipulation of a shoe during the rasping operation so that the operator can see the work as it progresses, as illustrated in dotted lines in Fig. 1.

In order further to aid the operator a small electric lamp 4| and reflector 42 is mounted by a simple universal clamp 43 to the shaft housing l2, thus allowing the operator to adjust the position of the lamp and to provide a constant source of illumination to the inside of the shoe. It is convenient and desirable that the lamp and refiector be mounted in cooperative relation with respect to the curved housing in such manner that the projected light rays also make an acute angle with the reflecting surface operated on by the rasp so that the entire forepart of the insole is illuminated and the reflected light issues in a manner convenient for observation by the operator as the shoe is manipulated against the rasp.

It will thus be seen that by means of the present invention there has been provided a device which will rapidly and efficiently accomplish the objects set forth and since certain changes may be made in the above construction and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A machine for the removal of excess hardened cement formed in a cement constructed shoe during the sole affixing operation in the marginal forepart area at the junction where the upper surface of, a randed insole aligns with the upper surface of a landed portion of a complementary outsole comprising, in combination, a driving means having a rigid support, a rearwardly curved shaft housing extending toward said support and in spaced relation thereto with the upper end of said housing associated with said driving means, a rotatable flexible shaft mounted in said housing and connected with said driving means, a horizontally disposed rotary cement removing rasp having a downwardly suspended horizontally disposed rasping face rotated by said shaft and associated with the lower end of said housing and projecting therebelow whereby said rasp is spaced sufficiently distant from said support and said housing to permit easy application and removal of a shoe and to allow said rasp horizontally to operate upon the forepart of an insole of a horizontally positioned shoe so that said forepart of said insole as well as said rasp are at all times presented to the observation of an operator to disclose the progress and permit control of the cement removing operation.

2. A machine for the removal of excess hardened cement formed in a cement constructed shoe during the sole aifixing operation in the marginal forepart area at the juncture where the upper surface of a randed insole aligns with the upper surface of a landed portion of a complementary outsole comprising, in combination: a driving means having a rigid support; a curved shaft housing the upper end of which extends horizontally away from said driving means and toward an operator, the midportion thereof extending substantially vertically downwardly, and the lower portion extending obliquely away from said operator; a flexible shaft within said housing; a split shaft tensioning support to permit forward and rearward movement of said shaft housing thereby taking up any slack or easing any tension upon said shaft; a horizontally disposed rotary cement removing rasp having a downwardly suspended horizontally disposed rasping face rotated by said shaft and associated with the lower end of said housing and projecting and therebelow so that said rasp is spaced sufficiently distant from said support and said housing to permit easy application and removal of a shoe by said operator and to allow said rasp horizontally to operate upon the forepart of an insole of a horizontally positioned shoe whereby said forepart of said insole as well as said rasp are at all times presented to the observation of an operator to disclose the progress and permit control of the cement removing operation.

WILLIAM C. CARD, JR. 

